sensor | Python 3 package that enables Raspberry Pi
kandi X-RAY | sensor Summary
kandi X-RAY | sensor Summary
This is a Python 3 package that enables Raspberry Pi to read various sensors. The chief motivation for this package is educational. I am teaching a Raspberry Pi course, and find it very troublesome for students having to download a separate library every time they use another sensor. With this package, download once and they are set (for my course, anyway). I hope you find it useful, too.
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Top functions reviewed by kandi - BETA
- Start the server
- Create a new temperature object
- Returns a tuple of all temperature components
- Update the sensor
- Handle a chat message
- Return the humidity
- Read from chat
- Calculate altitude from pressure level
- Create a new altitude object
- The resolution
- Reset the IOS device
- Update sensor data
- Read one channel
- Return a tuple of all pressure and temperature
- Return pressure
- Returns the temperature in degrees
- Read from chatroom
sensor Key Features
sensor Examples and Code Snippets
Lines of Code : 24
License : No License
Copyfrom sensor import BMP180
# I2C bus=1, Address=0x77
bmp = BMP180(1, 0x77)
p = bmp.pressure() # read pressure
print(p) # namedtuple
print(p.hPa) # hPa value
t = bmp.temperature() # read temperature
print(t) # named from sensor import HTU21D
# I2C bus=1, Address=0x40
htu = HTU21D(1, 0x40)
h = htu.humidity() # read humidity
print(h) # namedtuple
print(h.RH) # relative humidity
t = htu.temperature() # read temperature
print(t) from sensor import SHT20
# I2C bus=1, Address=0x40
sht = SHT20(1, 0x40)
h = sht.humidity() # read humidity
print(h) # namedtuple
print(h.RH) # relative humidity
t = sht.temperature() # read temperature
print(t) # @Override
public String toString() {
return new ToStringBuilder(this).append("INTVALUE", this.intValue).append("STRINGVALUE", this.strSample).toString();
} public void getTemperature(){
LOGGER.info("Getting temperature from the sensor..");
} Community Discussions
Trending Discussions on sensor
QUESTION
When I read data from GPS sensor, it comes with a slight delay. You are not getting values like 0,1 0,2 0,3 0,4 0,5 etc, but they are coming like 1 then suddenly 5 or 9 or 12. In this case needle is jumping back and forth. Anybody have an idea how to make needle moving smoothly? I guess some kind of delay is needed?
Something like, taken from another control:
...ANSWER
Answered 2022-Mar-21 at 22:09Coming from a controls background, to mimic behavior of an analog device, you could use an exponential (aka low-pass) filter.
There are two types of low-pass filters you can use, depending on what type of behavior you want to see: a first-order or second-order filter. To put it in a nutshell, if your reading was steady at 0 then suddenly changed to 10 and held steady at 10 (a step change), the first order would slowly go to 10, never passing it, then remain at 10 whereas the second order would speed up its progress towards 10, pass it, then oscillate in towards 10.
The function for an exponential filter is simple:
QUESTION
TL;DR how can I have an Android sensor permanently running/active/registered for my app, even if I close it?
Objective:
I'm making a Flutter application that counts your steps using the pedometer package,
which uses the built-in sensor TYPE_STEP_COUNTER of Android,
which returns the # of steps taken since last boot (iOS). On Android, any steps taken before installing the app are not counted.
How I implemented it:
- When the app is actively running in the foreground, each step causes
a
myStepCountto increment by 1. - In all other cases (phone locked, went to home-screen, closed the app...), the android
TYPE_STEP_COUNTERsensor should still be running in the background, and once I open my app again, the difference between newstepCountand last savedstepCount(saved using shared_prefs) will be calculated and added tomyStepCount.
Important:
The TYPE_STEP_COUNTER sensor must be permanently running/stay registered in the background, even after I lock my phone, go to the home-screen, or close the app...
Observations:
- On my Samsung Galaxy A02s, my app works perfectly fine, as it it supposed to
(as described above). That is because on that phone I also have the
Google Fit app installed, which tracks your steps 24/7 (so the
TYPE_STEP_COUNTERsensor is permanently registered). - On my Samsung Galaxy S7, my app does not work as it's supposed to.
myStepCountgets incremented when I take steps while the app is running in the foreground. But steps taken while the app is closed will NOT be added tomyStepCountonce I open the app again.
Note: I don't have any other step-counting-apps like Google Fit on this phone.
Conclusion:
I need to find a way to register the TYPE_STEP_COUNTER sensor from my Flutter app, and keep it registered even after I close the app.
2 Attempted (but unsuccessful) Solutions:
1st Attempt:
Calling Native Android Code from my Flutter Code to register the sensor
This is my main.dart file (with the unimportant parts left out for simplicity):
ANSWER
Answered 2022-Feb-09 at 22:13Update: I've contacted one of the developers of the pedometer package, and he suggested me to use flutter_foreground_service (which is developed by the same team/company as pedometer). It works.
But I would still find it interesting, if there is another way (maybe similar to my 2 failed attempts).
QUESTION
Let me introduce the following three classes: AbstractProcessor and these two child classes. The code below is not complex because there are only two child classes, but what if procedures1 and procedure2 both has many N candidate implementation? In such case, there are NxN child classes and a lot of duplication will be made by hand-coding. In the code below for example, each procedure can either be fast one or accurate one. So there are 2x2 possible child classes.
I would ask about technique/design pattern to reduce duplication. More precisely, is there any technique to reduce that NxN hand-coding to 2N hand-coding?
Noting that procedure1 and procedure2 both have to share the same var_ (in my case it is measurement value of physical world of robot) and the common function foo(), procedure1 and procudure2 can hardly be composed by a has-a relationship. Actually in my application, there are lot of var_ because the robot access to many type of sensors.
ANSWER
Answered 2022-Feb-09 at 08:09Inheritance is not the solution to everything. Sometimes all the problems are gone once you don't use inheritance. There are many different ways to do what you want. One is to store the callables as members:
QUESTION
In Flutter, there is the sensor package https://pub.dev/packages/sensors that allow to know the velocity X, Y and Z.
My question is : how could I calculate the distance of a phone thrown in height ?
Example : you throw your telephone, with your hand at 0.5 meter from the ground. The phone reaching 1 meter from your hand (so 1.5 meter from the ground).
How can I get the 1 meter value ?
Thanks all !
Here is the code I have right now (you need to install sensors package):
...ANSWER
Answered 2021-Nov-30 at 18:54Correct me if I'm wrong, but if you're trying to calculate a phone's absolute position in space at any moment in time directly from (past and present) accelerometer data, that is actually very complex, mainly because the phone's accelerometer's frame of reference in terms of x, y, and z is the phone itself... and phones are not in a fixed orientation, especially when being thrown around, and besides... it will have zero acceleration while in the air, anyway.
It's sort of like being blindfolded and being taken on a space journey in a pod with rockets that fire in different directions randomly, and being expected to know where you are at the end. That would be technically possible if you knew where you were when you started, and you had the ability to track every acceleration vector you felt along the way... and integrate this with gyroscope data as well... converting all this into a single path.
But, luckily, we can still get the height thrown from the accelerometer indirectly, along with some other measurements.
This solution assumes that:
- The sensors package provides acceleration values, NOT velocity values (even though it claims to provide velocity, strangely), because accelerometers themselves provide acceleration.
- Total acceleration is equal to sqrt(x^2 + y^2 + z^2) regardless of phone orientation.
- The accelerometer will read zero (or gravity only) during the throw
- This article in wired is correct in that Height = (Gravity * Time^2) / 8
The way my code works is:
- You (user) hold the "GO" button down.
- When you throw the phone up, naturally you let go of the button, which starts the timer, and the phone starts listening to accelerometer events.
- We assume that the total acceleration of the phone in the air is zero (or gravity only, depending on chosen accelerometer data type)... so we're not actually trying to calculate distance directly from the accelerometer data:
- Instead, we are using the accelerometer ONLY to detect when you have caught the phone... by detecting a sudden change in acceleration using a threshold.
- When this threshold is met, the timer is stopped.
- Now we have a total time value for the throw from beginning to end and can calculate the height.
Side notes:
- I'm using AccelerometerEvent (includes gravity), not UserAccelerometer event (does not include gravity), because I was getting weird numbers on my test device (non-zero at rest) using UserAccelerometerEvent.
- It helps to catch the phone gently ***
- My math could be complete off... I haven't had anyone else look at this yet... but at least this answer gets you started on a basic theory that works.
- My phone landed in dog poo so I hope you accept this answer.
Limitations on Accuracy:
- The height at which you let go, and catch are naturally going to be inconsistent.
- The threshold is experimental.... test different values yourself. I've settled on 10.
- There is probably some delay between the GO button depress and the timer beginning.
- *** The threshold may not always be detected accurately, or at all if the deceleration ends too quickly because the frequency of accelerometer updates provided by the sensors package is quite low. Maybe there is a way to get updates at a higher frequency with a different package.
- There is always the chance that the GO button could be depressed too early (while the phone is still in your hand) and so the acceleration will be non zero at that time, and perhaps enough to trigger the threshold.
- Probably other things not yet considered.
Code:
QUESTION
I am developing an app where the app will detect Bluetooth signals (Sensoro Smart Beacon device) and open the activity. But I want the app to still be able to detect the signal even when the application on the background or even when killed. I used a foreground service, it detects the signal when I open the application and move between activities but when sending the app to the background and opening other applications, the listener stops although the service still working. I am printing the logs. System.out.println("Sensoro 2" ); keeps printing even when I kill the application or open another application. But the printing logs in BeaconManagerListener are not working. I tried to use background service but it didn't work also.
Can you please advise if there is a way to make the listener works in a service when the app in background or killed?
Here is the service code:
ANSWER
Answered 2021-Nov-18 at 07:15I looked at the Android rules and regulations page
According to Google documents, from Android 8 onwards, all applications that do not have a Google-approved signature will be removed from the background after a few minutes.
But the solutions:
- The first solution is to run the application in debug mode
- The second solution is to assign a signature to the application and send it to Google for approval
recommend:
- The third solution is to remove the google play service application from the emulator or android phone
QUESTION
I'm currently developping a vision system which is controlled/moonitored via a computer application that I'm writting in C/C++. If you are wondering why I,m writting in C/C++ its basically that my vision sensor (LMI Gocator 2490) has functions developped in C and that I'm using opencv (C++) to analyse its data. Long story short, I've had 1 informatics course which was in C and I'm bad at C++.
I'm wondering if there is a simple way, using or writting a function for example, to retrieve an array index that loops back to its begining instead of trying to read write in an index that isn't part of the array which also causes mem access violation. For example:
...ANSWER
Answered 2021-Nov-21 at 17:33use modulus to wrap when reaching the upper bound
QUESTION
In Splunk, I am looking for logs that say "started with profile: [profile name]" and retrieve the profile name from found events. Then I want to use the profile name to look for other events (from a different source) and if one error or more are found, I would like to let it count as one found error, per platform.
To make things more clear I have the following search query (query one):
...ANSWER
Answered 2021-Oct-27 at 14:16First ... don't dedup on _raw
The _raw events are never duplicated (unless you've done something wrong on ingest)
Second, to your actual question - try something along the lines of this:
QUESTION
I'm creating an application that needs to detect the biggest acceleration that the phone detects. Currently it works, but it does not continue the task when the screen turns off. To achieve what I have now, I wrote in onCreate:
ANSWER
Answered 2021-Oct-25 at 15:41You won't be able to use the Sensors API when the app went to the background even with WakeLock - the official documentation is clear about that.
You can easily proceed with using Sensors API even with the phone screen disabled inside a foreground service, though. In order to do that use this documentation as a start - Foreground Service. This doesn't guarantee the eternal live of the Service but it will most definitely live longer than an ordinary Service as well as you will have the access to the Sensors API. I am not sure about WakeLock in this case - you will have to try(but I think you won't need it).
Here is a span of answers. Some of them contain sample code and even links to sample projects
Here and here there are neet examples in form of medium articles.
QUESTION
When I deploy React project to Netlify, I'm getting this error: enter image description here
(node:1551) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at /opt/build/repo/node_modules/postcss-safe-parser/node_modules/postcss/package.json.
Update this package.json to use a subpath pattern like "./*".
(Use node --trace-deprecation ... to show where the warning was created)
Creating an optimized production build...
Failed to compile.
./src/assets/css/responsive.css ParserError: Syntax Error at line: 1, column 23 at Array.forEach () at Array.forEach () error Command failed with exit code 1.
responive.css
...ANSWER
Answered 2021-Sep-03 at 07:05The reason behind this is because the react-build-scripts use postcss-safe-parser which sees the addition you're trying to do in the clamp as invalid/not safe. You can resolve the error by adding a calc function to the addition you're trying to perform in the clamp functions.
Notice, we now calculate the values of the addition you're trying to perform in the function parameters:
QUESTION
I am trying to find the beginning and the end of a linear curve. There might be some dips in the curve, so there should be a "if less than x for y seconds, then ignore"
the flat line at beginning and end is not 0, but is a measurement of the background noise from the sensor.
I am sure that there is a name for this in scipy or something, but thus far, I have been unable to find it, so can anyone help (not necessarily in scipy or pandas)
code and graph example below. I need to know the time (in nanoseconds) for T1 and T2, so I can find the total time for the measurement.
...ANSWER
Answered 2021-Aug-31 at 21:03So I would implement a moving average and then get the min and max timestamps when the rolling average is above a certain value.
The following code should help:
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